Omega CDTX-45 Owner's manual

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CDTX-45

4-Electrode Conductivity Monitor

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User’s Guide

M

ADE IN

Servicing North America:

U.S.A.: One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford, CT 06907-0047

TEL: (203) 359-1660

FAX: (203) 359-7700

e-mail: [email protected]

Canada: 976 Bergar

Laval (Quebec) H7L 5A1, Canada

TEL: (514) 856-6928

FAX: (514) 856-6886

e-mail: [email protected]

For immediate technical orapplication assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA

®

Customer Service: 1-800-622-2378/1-800-622-BEST

®

Engineering Service: 1-800-872-9436/1-800-USA-WHEN

®

Mexico: En Espan˜ol: (001) 203-359-7803

e-mail: [email protected]

FAX: (001) 203-359-7807

[email protected]

Servicing Europe:

Czech Republic: Frystatska 184, 733 01 Karviná, Czech Republic

TEL: +420 (0)59 6311899

FAX: +420 (0)59 6311114

Toll Free: 0800-1-66342

e-mail: [email protected]

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

TEL: +49 (0)7056 9398-0

FAX: +49 (0)7056 9398-29

Toll Free in Germany: 0800 639 7678

e-mail: [email protected]

United Kingdom: One Omega Drive, River Bend Technology Centre

ISO 9002 Certified Northbank, Irlam, Manchester

M44 5BD United Kingdom

TEL: +44 (0)161 777 6611

FAX: +44 (0)161 777 6622

Toll Free in United Kingdom: 0800-488-488

e-mail: [email protected]

OMEGAnet

®

Online Service Internet e-mail

omega.com info@omega.com

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI

regulations that apply. OMEGA is constantly pursuing certification of its products to the European New

Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any

errors it contains, and reserves the right to alter specifications without notice.

WARNING: These products are not designed for use in, and should not be used for, human applications.

- 2 -

Table of Contents

PART 1 - INTRODUCTION ............................................................................................................................... 4

1.1 General ................................................................................................................................................... 4

1.2 Features .................................................................................................................................................. 5

1.3 CDTX-45 System Specifications ............................................................................................................. 7

1.4 CDTX-45 Performance Specifications ..................................................................................................... 9

PART 2 – ANALYZER MOUNTING ............................................................................................................... 10

2.1 General ................................................................................................................................................. 10

Figure 2-1 CDTX-45 Enclosure Dimensions, AC Powered Units .............................................................. 11

Figure 2-2 CDTX-45 Enclosure Dimensions, 2-Wire Unit ....................................................................... 12

2.2 Wall or Pipe Mount ............................................................................................................................... 13

Figure 2-3 Wall or Pipe mount Bracket.................................................................................................... 13

Figure 2-4 Wall Mounting Diagram ........................................................................................................ 14

Figure 2-5 Pipe Mounting Diagram ......................................................................................................... 14

2.3 Panel Mount, AC Powered Monitor ....................................................................................................... 15

Figure 2-6 115/230 VAC Panel Mount and Cut-out ................................................................................. 15

PART 3 – SENSOR MOUNTING ..................................................................................................................... 16

3.1 General ................................................................................................................................................. 16

Figure 3-1 CDTX-45 Sensor Dimensions ................................................................................................ 16

Figure 3-2 CDTX Sanitary Style and Flow-Through Tee Mount .............................................................. 17

3.2 Electrical .............................................................................................................................................. 18

Figure 3-3 Cable Description, Model CDTX-45 Sensor .......................................................................... 18

PART 4 – ELECTRICAL INSTALLATION .................................................................................................... 19

4.1 General ................................................................................................................................................. 19

4.2 Two-Wire ............................................................................................................................................. 19

Figure 4-1 Loop-Power Connection, CDTX-45 Transmitter ................................................................... 20

4.21 Load Drive ........................................................................................................................................ 21

4.3 115/230 VAC w/Relays......................................................................................................................... 21

Figure 4-2 Line Power Connection .......................................................................................................... 23

Figure 4-3 Relay Contacts ...................................................................................................................... 24

4.4 Sensor Wiring ....................................................................................................................................... 24

4.5 Direct Sensor Connection ...................................................................................................................... 24

Figure 4-4 Sensor Cable Preparation....................................................................................................... 25

4.6 Junction Box Connection ...................................................................................................................... 26

Figure 4-5 Junction Box Interconnect Wiring ......................................................................................... 26

PART 5 – CONFIGURATION .......................................................................................................................... 27

5.1 User Interface ....................................................................................................................................... 27

Figure 5-1 User Interface........................................................................................................................ 27

5.11 Keys ................................................................................................................................................. 28

5.12 Display ............................................................................................................................................. 28

5.2 Software ............................................................................................................................................... 30

5.21 Software Navigation ......................................................................................................................... 30

Figure 5-2 Software Map ....................................................................................................................... 32

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5.22 Measure Menu [MEASURE] ............................................................................................................. 33

5.23 Calibration Menu [CAL] ...................................................................................................................... 34

5.24 Configuration Menu [CONFIG] ........................................................................................................ 35

PART 6 - CONTROL ......................................................................................................................................... 39

Figure 6-1 Control Relay Example, Hysteresis and Two Opposite Phase Options .................................... 41

Figure 6-2 Alarm Relay Example ........................................................................................................... 42

PART 7 – CALIBRATION ................................................................................................................................ 43

7.1 Overview and Methods ......................................................................................................................... 43

7.11 1-Point Calibration Explained ............................................................................................................ 43

7.12 Zero Cal Calibration Explained.......................................................................................................... 43

7.2 Performing a Sensor Zero Calibration .................................................................................................... 44

7.3 Performing a 1-Point Calibration ........................................................................................................... 44

Figure 7-1 NaCl Reference Solution for Calibration ................................................................................ 45

7.4 Temperature Calibration........................................................................................................................ 46

PART 8 – PID CONTROLLER DETAILS ....................................................................................................... 48

8.1 PID Description .................................................................................................................................... 48

8.2 PID Algorithm ...................................................................................................................................... 48

Figure 8-1 (Ideal) PID Equation ............................................................................................................... 49

8.3 Classical PID Tuning ............................................................................................................................ 50

8.4 Common PID Pitfalls ............................................................................................................................ 51

PART 9 – SYSTEM MAINTENANCE .............................................................................................................. 52

9.1 System Checks ...................................................................................................................................... 52

9.2 Instrument Checks ................................................................................................................................ 52

9.3 Cleaning the Sensor .............................................................................................................................. 53

9.4 Troubleshooting .................................................................................................................................... 54

9.5 Display Messages ................................................................................................................................. 55

Omega CDTX-45 Conductivity System Part 1– Introduction

- 4 -

Part 1 - Introduction

1.1 General

The Model CDTX-45 Conductivity monitor/analyzer provides an extremely

versatile measurement system for monitoring and control of conductivity over the

range of 1 µS/cm to 2.000 Siemens/cm. The instrument is offered standard as a

loop-powered transmitter for 2-wire DC applications. Since this system

configuration operates over only two low-voltage wires, it is ideal for remote

monitoring applications where line power is either unavailable or prohibitively

expensive to run.

With the optional 115/230 VAC power supply, the instrument may also be

configured for AC operation. This configuration is ideal when line power is

located close to the point of installation, and two relays and two 4-20 mA outputs

(one for conductivity and one for temperature) are required.

In all configurations, the CDTX-45 displays conductivity on the main display, and

total dissolved solids (TDS), sensor temperature, and output loop current on the

secondary line of the custom display.

WARNING: Not following operating instructions may impair safety.

NOTE: Due to the high degree of flexibility of the CDTX-45 system options, it is

important to note areas of the operating manual that detail these optional

features. The software features for the relay output option and battery option

only appear when those modules are connected and the system has been re-

powered.

Omega CDTX-45 Conductivity System Part 1– Introduction

- 5 -

1.2 Features

• Standard CDTX-45 electronic transmitters are designed to be fully isolated, loop

powered instruments for 2-wire DC applications. Optional integral power supply

card for 115/230 VAC operation, and optional battery power supply card for

portable datalogging applications are available.

• High accuracy, high sensitivity system, measures from 1 to 2,000,000 uS through

7 internal automatic ranges. User display ranges include 2000 us, 2.000 mS,

20.00 mS, or 200.0 mS, 2000 mS, or 2.000 S.

• Output Hold, Output Simulate, Output Alarm, and Output Delay Functions. All

forced changes in output condition include bumpless transfer to provide gradual

return to on-line signal levels and to avoid system control shocks on both analog

outputs.

• AC power option provides dual SPDT relay operation and one additional isolated

analog output. Software settings for relay control include setpoint, deadband,

phase, delay, and failsafe. Software controls automatically appear in menu list

when hardware option card is plugged in and system power is applied.

• Selectable PID controller on main analog output. PID controller can operate with

instrument configured as loop-power transmitter, or as one of the two outputs on

the AC powered instrument. PID includes manual operation feature, and

diagnostic “stuck-controller” timer feature for relay notification of control

problems.

• Configurable for TDS display and signal output on one analog output.

• Two analog outputs on the relay version may be configured to track conductivity

and temperature, conductivity and conductivity, or conductivity and TDS. Both

analog outputs can be individually programmed to fail to specific values.

• Selectable Output Fail Alarm feature on Relay B allows system diagnostic

failures to be sent to external monitoring systems.

• Selectable Probe Timer feature on Relay B allows connection of probe cleaner

hardware or other accessories that require timed periodic relay contacts.

• Large, high contrast, custom Super-Twist display provides excellent readability

even in low light conditions. The secondary line of display utilizes 5x7 dot matrix

characters for clear message display. Two of the four measured parameters

may be on the display simultaneously.

Omega CDTX-45 Conductivity System Part 1– Introduction

- 6 -

• 4-Electrode measurement system. Two of the electrodes are used to establish

the sensor drive potential, while the other two sense the flow of current between

the drive electrodes and maintain proper drive potential. Sensor diagnostics

monitor electrode coating/fouling, sensor leaks, and RTD condition. Diagnostic

messages provide a clear description of any problem with no confusing error

codes to look up. Messages are also included for diagnosing calibration

problems.

• Quick and easy one-point calibration method and sensor zero-cal. To provide

high accuracy, all calibration methods include stability monitors that check

temperature and main parameter stability before accepting data.

• High accuracy Pt1000 temperature input. Temperature element can be user

calibrated.

• Security lock feature to prevent unauthorized tampering with transmitter settings.

All settings can be viewed while locked, but they cannot be changed.

• High reliability, microprocessor-based system with non-volatile memory back-up

that utilizes no batteries. Low mass, surface mount PCB construction containing

no adjustment potentiometers. All factory calibrations stored in non-volatile

EEPROM.

• PEEK electrode insulator, custom rear PEEK sealing nut and triple o-ring rear

seal (FKM and EPR) allow complete submersion of the sensor.

• Custom double-shielded cross-linked cable with PE jacket for excellent chemical

resistance.

• Pt1000 RTD. The temperature element used in Omega sensors is highly

accurate and provides a highly linear output.

Omega CDTX-45 Conductivity System Part 1– Introduction

- 7 -

1.3 CDTX-45 System Specifications

(Common to all variations)

Displayed Parameters Main input, 0 uS to 2S (2,000,000 uS)

Sensor temperature, -10.0 to 210.0 °C (23 to 410 ºF)

Loop current, 4.00 to 20.00 mA

Sensor slope

Model number and software version

PID Controller Status

Timer Status

Main Parameter Ranges Automatic or Manual selection of one of the following

display ranges,

0 to 2000 uS

0.0 to 2.000 mS

0.00 to 20.00 mS

0.0 to 200.0 mS

0 to 2000 mS

0.000 to 2.000 S

Display Large, high-contrast, Super-Twist (STN) LCD;

4-digit main display with sign, 0.75" (19.1 mm) seven-

segment characters

12-digit secondary display, 0.3" (7.6 mm) 5x7 dot matrix

characters

Keypad 4-key membrane type with tactile feedback, polycarbonate

with UV coating

Weight DC transmitter configuration: 1 lb. (0.45 kg)

Line powered unit: 1.5 lb. (0.68 kg)

Ambient Temperature Analyzer Service, -20 to 60 °C (-4 to 140 ºF)

Storage, -30 to 70 °C (-22 to 158 ºF)

Ambient Humidity 0 to 95%, indoor/outdoor use, non-condensing to rated

ambient temperature range

Altitude Up to 2000 m (6562 Ft.)

EMI/RFI Influence Designed to EN 61326-1

Output Isolation 600 V galvanic isolation

Filter Adjustable 0-9.9 minutes additional damping to 90% step

input

Temperature Input Pt1000 RTD with automatic compensation

Omega CDTX-45 Conductivity System Part 1– Introduction

- 8 -

Sensor Fully isolated 4-electrode electrode sensor design for direct

measurement. 1” NPT process connection.

Measuring Range 0.000 to 2.000 S/cm

Wetted Materials Titanium, PEEK, FKM, EPR

(316SS when sensor is submersion mounted)

Temperature Compensation Pt1000 RTD

Sensor Cable 6 Conductor plus 2 shields,

Temperature Pressure Range The choice of sensor material/ mounting option and the

hardware used to mount the sensor will determine the

temperature and pressure ratings. Please consult the

factory for relevant temperature and pressure rating

information.

Maximum Flow Rate 10 feet (3 meters) per second

Max. Sensor-Analyzer

Distance 60 feet (18.2 meters)

Weight 1 lb. (0.45 kg)

(NOT common to all variations)

Standard 2-Wire (Loop-powered) Transmitter:

Power 16-35 VDC (2-wire device)

Enclosure: NEMA 4X, polycarbonate, stainless steel hardware,

weatherproof and corrosion resistant,

HWD: 4.4" (112 mm) x 4.4" (112 mm) x 3.5" (89 mm)

Mounting Options Wall or pipe mount bracket standard. Bracket suitable for

either 1.5” or 2” I.D. U-Bolts for pipe mounting.

Conduit Openings Two PG-9 openings with gland seals, One 1” NPT opening

with plug.

DC Cable Type Belden twisted-pair, shielded, 22 gauge or larger

Insertion Loss 16 VDC

Omega CDTX-45 Conductivity System Part 1– Introduction

- 9 -

115/230 VAC + Dual Relay Option:

Power 115/230 VAC ± 10%, 50/60 Hz, 10 VA max

Enclosure, AC Powered NEMA 4X, polycarbonate, stainless steel hardware,

weatherproof and corrosion resistant,

HWD: 4.9" (124 mm) x 4.9" (124 mm) x 5.5" (139 mm)

Mounting Options Wall or pipe mount bracket standard. Bracket suitable for

either 1.5” or 2” I.D. U-Bolts for pipe mounting.

Panel mount adapter optional.

Conduit Openings Three ½” NPT openings. Gland seals supplied but not

installed.

Relays, Electromechanical: Two SPDT, 6 amp @ 250 VAC, 5 amp @ 24 VDC

contacts. Software selection for setpoint, phase, delay,

deadband, hi-lo alarm, and failsafe. A-B indicators on

main LCD.

Analog Outputs Two 4-20 mA outputs. Output one programmable for

conductivity or PID. Output 2 programmable for

conductivity, temperature, or TDS. Max load 500 Ohms for

each output. Outputs ground isolated and isolated from

each other.

1.4 CDTX-45 Performance Specifications

(Common to all variations)

Accuracy 0.5% of user range, or better (± 2 μS)

Repeatability 0.2% of user range, or better (± 2 μS)

Sensitivity 0.05% of user ranges (± 2 μS)

Stability 0.2% of user range per 24 hours, non-cumulative

Warm-up Time 7 seconds to rated performance

Supply Voltage Effects DC version only, ± 0.05% of user range

Instrument Response Time 6 seconds to 90% of step input at lowest setting

Temperature Drift Span or zero, 0.04% of span/°C

OMEGA CDTX-45 Conductivity System Part 2– Analyzer Mounting

- 10 -

Part 2 – Analyzer Mounting

2.1 General

All CDTX-45 Series instruments offer maximum mounting flexibility. A bracket is

included with each unit that allows mounting to walls or pipes. In all cases,

choose a location that is readily accessible for calibrations. Also consider that it

may be necessary to utilize a location where solutions can be used during the

calibration process. To take full advantage of the high contrast display, mount

the instrument in a location where the display can be viewed from various angles

and long distances.

Locate the instrument in close proximity to the point of sensor installation - this

will allow easy access during calibration. The standard cable length of the

conductivity sensor is 20 feet. For sensor cables longer than 20 feet, use the

optional junction box and sensor interconnect cable.

Due to the flexibility of the instrument design, some of the mounting features

change based on the configuration that was ordered. For example, the 2-wire

transmitter version is different for the 115/230 VAC controller because the rear of

the enclosure is much deeper when the AC powered unit is used. In addition, the

AC powered unit has an integrated panel mount flange requiring a single cutout

for flush mounting. In the 2-wire transmitter configuration, just the front of the

enclosure can be mounted, but the cutout also requires accurate location of 4

mounting holes. Refer to Figures 2-1 and 2-2 for detailed dimensions of each

type of system.

OMEGA CDTX-45 Conductivity System Part 2– Analyzer Mounting

- 11 -

Figure 2-1 CDTX-45 Enclosure Dimensions, AC Powered Units

ENTER

MENU

ESC

OMEGA CDTX-45 Conductivity System Part 2– Analyzer Mounting

- 12 -

Figure 2-2 CDTX-45 Enclosure Dimensions, 2-Wire Unit

1" NPT

1.23

(31.2)

.82

(20.8)

BOTTOM VIEW

3.45

(87.6)

1.68

(42.7)

SIDE VIEW

4.38

(111.2)

4.38

(111.2)

ENTER

MENU

ESC

FRONT VIEW

2.61

(66.3)

2.61

(66.3)

#10-32 UNF

(4 PLACES)

BACK VIEW

PG-9 PORT

(2 PLACES)

1.23

(31.2)

BOTTOM VIEW

OMEGA CDTX-45 Conductivity System Part 2– Analyzer Mounting

- 13 -

2.2 Wall or Pipe Mount

A PVC mounting bracket with attachment screws is supplied with each

transmitter (see Figure 2-3 for dimensions). The multi-purpose bracket is

attached to the rear of the enclosure using the four flat head screws. The

instrument is then attached to the wall using the four outer mounting holes in the

bracket. These holes are slotted to accommodate two sizes of u-bolt that may be

used to pipe mount the unit. Slots will accommodate u-bolts designed for 1½“ or

2” pipe. The actual center to center dimensions for the u-bolts are shown in the

drawing. Note that these slots are for u-bolts with ¼-20 threads.

Figure 2-3 Wall or Pipe mount Bracket

OMEGA CDTX-45 Conductivity System Part 2– Analyzer Mounting

- 14 -

Figure 2-4 Wall Mounting Diagram

Figure 2-5 Pipe Mounting Diagram

ENTER

MENU

ESC

ENTER

MENU

ESC

OMEGA CDTX-45 Conductivity System Part 2– Analyzer Mounting

- 15 -

2.3 Panel Mount, AC Powered Monitor

Panel mounting of an AC powered monitor uses the panel mounting flange

molded into the rear section of the enclosure. Figure 2-6 provides dimensions for

the panel cutout required for mounting.

The panel mounting bracket kit must be ordered separately. This kit contains a

metal retainer bracket that attaches to the rear of the enclosure, 4 screws for

attachment of this bracket, and a sealing gasket to insure that the panel mounted

monitor provides a water tight seal when mounted to a panel.

The sealing gasket must first be attached to the enclosure. The gasket contains

an adhesive on one side so that it remains in place on the enclosure. Remove

the protective paper from the adhesive side of the gasket and slide the gasket

over the back of the enclosure so that the adhesive side lines up with the back of

the enclosure flange. Once in place, you can proceed to mount the monitor in

the panel.

Figure 2-6 115/230 VAC Panel Mount and Cut-out

OMEGA CDTX-45 Conductivity System Part 3 – Sensor Mounting

- 16 -

Part 3 – Sensor Mounting

3.1 General

The CDTX-45 Conductivity Sensor is designed for industrial and municipal

process applications. Mounting options include flow-through, submersion,

insertion (special hardware required), or integral mount to the CDTX-45

Conductivity Monitor/Analyzer. The sensor-to-analyzer distance must not exceed

60 feet (18.2 meters).

Calibrate the sensor before placing it into the process. See Part 6 of this manual

for detailed calibration instructions.

The sensor comes with a removable guard that surrounds the electrode face.

This guard minimizes interference effects in tight locations where the sensor face

is close to surrounding objects. If it is removed, take care to leave at least 1 in

3

of space in front of the electrodes. If the guard is to be used, the sensor must be

calibrated with it in place, since the guard affects the sensor cell constant.

Figure 3-1 CDTX-45 Sensor Dimensions

OMEGA CDTX-45 Conductivity System Part 3 – Sensor Mounting

- 17 -

Figure 3-2 CDTX Sanitary Style and Flow-Through Tee Mount

OMEGA CDTX-45 Conductivity System Part 3 – Sensor Mounting

- 18 -

3.2 Electrical

The Model CDTX-45 sensor comes standard with 15 feet of 6 conductor double

shielded cable. The cable is permanently attached to the sensor, and a PEEK

cordgrip is used to seal around the cable. Nevertheless, the cable should always

be kept as clean and dry as possible.

DANGER: DO NOT connect sensor cable to power lines. Serious injury

may result.

Take care to route sensor cable away from AC power lines, adjustable frequency

drives, motors, or other noisy electrical signal lines. Do not run signal lines in the

same conduit as AC power lines. Run signal cable in dedicated metal conduit if

possible. For optimum electrical noise protection, run an earth ground wire to the

ground terminal in the transmitter

Refer to Figure 3-3, Cable Description and Figure 4-1, Wiring Diagram for

illustrative details on electrical installation.

Figure 3-3 Cable Description, Model CDTX-45 Sensor

Only 6-wire shielded interconnect cable must be used when connecting the

Model CDTX-45 sensor to the analyzer. This high-performance, double shielded,

polyethylene jacketed cable is specially designed to provide the proper signal

shielding for the sensor used in this system. No substitutions can be made.

Substituted cables may cause problems with system performance.

OMEGA CDTX-45 Conductivity System Part 4 – Electrical Installation

- 19 -

Part 4 – Electrical Installation

4.1 General

The CDTX-45 is powered in one of two ways, depending on the version

purchased. The 2-wire version is a 16-35 VDC powered transmitter. The

integral 115/230 VAC version requires line power. Please verify the type of unit

before connecting any power.

WARNING: Do not connect AC line power to the 2-wire module.

Severe damage will result.

Important Notes:

1. Use wiring practices that conform to all national, state and local

electrical codes. For proper safety as well as stable measuring

performance, it is important that the earth ground connection be

made to a solid ground point (Figure 4-1). The AC power

supply contains a single 100mA (115V) or 50mA (230V) slo-blo

fuse. The fuse F1 is located adjacent to TB5 and is easily

replaceable.

2. Do NOT run sensor cables or instrument 4-20 mA output wiring

in the same conduit that contains AC power wiring. AC power

wiring should be run in a dedicated conduit to prevent electrical

noise from coupling with the instrumentation signals.

3. This analyzer must be installed by specifically trained personnel

in accordance with relevant local codes and instructions

contained in this operating manual. Observe the analyzer's

technical specifications and input ratings. Proper electrical

disconnection means must be provided prior to the electrical

power connected to this instrument, such as a circuit breaker -

rated 250 VAC, 2 A minimum. If one line of the line power

mains is not neutral, use a double-pole mains switch to

disconnect the analyzer.

4.2 Two-Wire

In the two-wire configuration, a separate DC power supply must be used to

power the instrument. The exact connection of this power supply is dependent

on the control system into which the instrument will connect. See Figure 4-1 for

further details. Any twisted pair shielded cable can be used for connection of the

instrument to the power supply. Route signal cable away from AC power lines,

adjustable frequency drives, motors, or other noisy electrical signal lines. Do not

run sensor or signal cables in conduit that contains AC power lines or motor

leads.

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Omega CDTX-45 Owner's manual

Omega CDTX-45 Owner's manual

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